JEE Main 2021 (Online) 16th March Morning Shift | Practical Organic Chemistry Question 30 | Chemistry

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JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

In chromotography technique, the purification of compound is independent of :

Solubility of the compound

Mobility or flow of solvent system

Physical state of the pure compound

Length of the column or TLC plate

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-1

On treating a compound with warm dil. H₂SO₄, gas X is evolved which turns K₂Cr₂O₇ paper acidified with dil. H₂SO₄ to a green compound Y. X and Y respectively are :

X = SO₂, Y = Cr₂O₃

X = SO₃, Y = Cr₂(SO₄)₃

X = SO₃, Y = Cr₂O₃

X = SO₂, Y = Cr₂(SO₄)₃

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I : The identification of Ni²⁺ is carried out by dimethyl glyoxime in the presence of NH₄OH.

Statement II : The dimethyl glyoxime is a bidentate neutral ligand.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is false but Statement II is true.

Statement I is true but Statement II is false.

Both Statement I and Statement II are false.

Both Statement I and Statement II are true.

JEE Main 2021 (Online) 24th February Morning Slot

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

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